/Engine/Source/Runtime/UMG/Public/Animation/MovieSceneWidgetMaterialSystem.h
struct FPreAnimatedWidgetMaterialParameterStorage : public [UE::MovieScene::TPreAnimatedStateStorage< TPreAnimatedMaterialParameterTraits< FWidgetMaterialAccessor, UObject *, FWidgetMaterialHandle > >](API\Runtime\MovieScene\Evaluation\PreAnimatedState\TPreAnimatedStateStorage)